JEST接收到的函数未抛出，但抛出了HTTPError [英] JEST Received function did not throw, but HTTPError is thrown

问题描述

我正在使用JEST和Got测试端点.我预计会出现403禁止错误.以下代码从catch块中打印错误，并且失败，即相同的调用未引发错误.为什么?

I am testing an endpoint with JEST and Got. I expect 403 Forbidden error. The following code prints the error from catch block AND fails that the identical call does not throw an error. Why?

    try {
        response = await api(`verify/${profile.auth.verifyToken}`, {method: 'POST'}).json();
    } catch (e) {
        console.log(e);
    }
    expect(async () => {
        response = await api(`verify/${profile.auth.verifyToken}`, {method: 'POST'}).json();
    }).toThrow();

输出:

console.log test/api.int.test.js:112
HTTPError: Response code 403 (Forbidden)
    at EventEmitter.<anonymous> (C:\dev\mezinamiridici\infrastructure\node_modules\got\dist\source\as-promise.js:118:31)
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  name: 'HTTPError'
}


Error: expect(received).toThrow()
Received function did not throw

此变体也不起作用:

expect(() => api(`verify/${profile.auth.verifyToken}`, {method: 'POST'})).toThrow();

顺便说一句，当抛出HTTPError并没有捕获到HTTPError时，就没有堆栈跟踪，而且我也看不到在哪里抛出了错误.如果还有其他错误，我会确切地看到是哪条测试线造成的.为什么?

Btw when the HTTPError is thrown and not catched, there is no stacktrace and I do not see where the error was thrown. If there are other error I exactly see which test line was responsible. Why?

推荐答案

expect(...).toThrow()用于检查是否从同步函数中引发了错误.尽管异步函数使用相同的throw/catch术语，但它并未涵盖对Promise是否陷入拒绝状态的测试.

expect(...).toThrow() is for checking if an error is thrown from a synchronous function. It does not cover testing if a Promise falls into a rejected state, despite the fact that async functions use the same throw/catch terminology.

尝试 expect(...).rejects.toThrow() 代替:

await expect(() => api(`verify/${profile.auth.verifyToken}`, {method: 'POST'}).json())
  .rejects.toThrow();

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